Convert 800 MHx Maxtrac to 902 MHx ?
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Convert 800 MHx Maxtrac to 902 MHx ?
I have an 800 MHz Maxtrac (D35MQA5GB5BK) that I want to use as a 902 MHz receiver. I also have a conventional EPROM that I can use to convert it to a conventional radio.
I need to review the process to do this.
Do I blank the radio first, then change the EPROM and re-initialize ?
The reason I need to make it conventional is to get the COR signal on the accessory plug which does not seem possible if its a trunking radio.
After that I can do the rest of the "surgery".
Thanks, Dick, W1KSZ
I need to review the process to do this.
Do I blank the radio first, then change the EPROM and re-initialize ?
The reason I need to make it conventional is to get the COR signal on the accessory plug which does not seem possible if its a trunking radio.
After that I can do the rest of the "surgery".
Thanks, Dick, W1KSZ
Assuming you are satisfied that the radio is working properly first, you do just as you said. (Assuming you have a radio that has the talkaround (Tx 851-870) VCO)
First blank the radio. Regular Maxtrac LAB will do this even if the radio is a trunking model.
Then change the firmware. Next reinitialize the radio as a conventional unit. You should go through the alignment section of the board replacement at this time. Since you are going to use it as a receiver - you can skip over the transmit settings, but getting the crystal data in will make the radio stay on frequency.
Last step is to do your conversion (change the front end filters) Makes a great repeater or link receiver.
Good luck.
First blank the radio. Regular Maxtrac LAB will do this even if the radio is a trunking model.
Then change the firmware. Next reinitialize the radio as a conventional unit. You should go through the alignment section of the board replacement at this time. Since you are going to use it as a receiver - you can skip over the transmit settings, but getting the crystal data in will make the radio stay on frequency.
Last step is to do your conversion (change the front end filters) Makes a great repeater or link receiver.
Good luck.
800 MHz Maxtrac Conversion
Where do I find the Rosetta Stone that tells me which VCO I have ?
Thanks, Dick, W1KSZ
Thanks, Dick, W1KSZ
Your RF board should be an HLF9122 which has the talkaround VCO. Removing Q205 on this board is one way of causing the VCO to operate on the upper range at all times (which is where you want it so you get low side injection for the 902 band)
The other RF board - HLF4095 - usually does not have the talkaround capable VCO.
The other RF board - HLF4095 - usually does not have the talkaround capable VCO.
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OK, I've got one in front of me right now...xmo wrote:Your RF board should be an HLF9122 which has the talkaround VCO. Removing Q205 on this board is one way of causing the VCO to operate on the upper range at all times (which is where you want it so you get low side injection for the 902 band)
I don't have a manual, so I am hoping someone will take a photo of which transisor Q205 is for we who are manual-less.
Thank you!
Last edited by Jonathan KC8RYW on Sun Jan 02, 2005 11:20 pm, edited 2 times in total.
73 DE KC8RYW
Random Motorola Part Number:
SYN1894B - V3m Sprint-branded Battery Cover
Random Motorola Part Number:
SYN1894B - V3m Sprint-branded Battery Cover
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- was grem467
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OK, for once and for all...
A or B?
A or B?
Last edited by Jonathan KC8RYW on Mon Jul 26, 2004 9:09 am, edited 2 times in total.
73 DE KC8RYW
Random Motorola Part Number:
SYN1894B - V3m Sprint-branded Battery Cover
Random Motorola Part Number:
SYN1894B - V3m Sprint-branded Battery Cover
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- Posts: 1747
- Joined: Fri Dec 28, 2001 4:00 pm